Thank you very much for responding. Unfortunately it doesn't work. I have tried several combinations, but it doesn't work. Either I get error messages about disabled characters or it sends me to the search page showing me all the books they have. I checked the source code and found that the URL to send the search is
https://epublibre.org/catalogo/index, the field they use to send the data to search is called
bus so the full address would be
https://epublibre.org/catalogo/index?bus={author}
but it doesn't work.
This is the source code of the form. I hope it helps in some way, but I don't think it will be possible in this case.
Code:
<form action="https://epublibre.org/catalogo/index" method="post" accept-charset="utf-8">
<div style="display:none">
<input type="hidden" name="csrf_test_name" value="b1deecb4e9ca716fcedd8662321e9072" />
</div>
<div class="input-append">
<input class="input-small busca_inverse" id="bus" name="bus" type="text" placeholder="título, autor, colección" autocomplete="off" onblur="javascript:cambiar2();" onfocus="javascript:cambiar();"/>
<button id="buscador_btn" class="btn btn-small btn-inverse" type="submit" onblur="javascript:cambiar2();" onfocus="javascript:cambiar();">
<i id="buscador_icon" class="icon-search icon-white"></i>
</button>
</div>
</form>